poison oak

Noun poison oak has 2 senses

• poison oak(n = noun.state) - dermatitis resulting from contact with a poison oak plant;
is a kind of rhus dermatitis

• poison oak(n = noun.plant) markweed, poison ivy, poison mercury, rhus radicans, toxicodendron radicans - climbing plant common in eastern and central United States with ternate leaves and greenish flowers followed by white berries; yields an irritating oil that causes a rash on contact;
is a member of genus toxicodendron, toxicodendron
is a kind of poisonous plant